The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 13, 1976
Filed:
Jun. 26, 1975
Michiyuki Tokashiki, Tokuyama, JA;
Hiroshi Sakai, Iwakuni, JA;
Teijin Limited, Osaka, JA;
Abstract
A process for the preparation of alkyltetralins which comprises feeding an alkenylbenzene into a reaction zone continuing a fixed bed of an acidic cyclization catalyst, and cyclizing it in the liquid phase at a temperature not higher than about 300.degree. C., characterized in that: I. at least a part of the reaction mixture containing the unreacted alkenylbenzene, which has been withdrawn from said reaction zone and in which the conversion of alkenylbenzene is below the intended final conversion, is cooled, and at least a part of the cooled reaction product in an amount sufficient to adjust the temperature of the reaction zone to not higher than about 300.degree. C. is recycled to said reaction zone, and Ii. the remainder of the reaction product is led into another reaction zone containing a fixed bed of acidic cyclization catalyst, and without the aforesaid recycling, further cyclized in the liquid phase until the intended final conversion is attained.